Photon-assisted tunneling through self-assembled InAs quantum dots in the terahertz frequency range

We have investigated terahertz (THz) photon-assisted tunneling in single self-assembled InAs quantum dots (QDs). Two types of photon-assisted tunneling processes have been observed in the THz range: ground state resonance and photon-induced excited state resonance, depending on the relative magnitud...

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Bibliographic Details
Published in:Physical review letters 2012-08, Vol.109 (7), p.077401-077401, Article 077401
Main Authors: Shibata, K, Umeno, A, Cha, K M, Hirakawa, K
Format: Article
Language:English
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Summary:We have investigated terahertz (THz) photon-assisted tunneling in single self-assembled InAs quantum dots (QDs). Two types of photon-assisted tunneling processes have been observed in the THz range: ground state resonance and photon-induced excited state resonance, depending on the relative magnitude between the orbital quantization energy of the QDs and the THz photon energy. Furthermore, we could realize a very high coupling efficiency between THz waves and QDs and observed multiphoton absorption up to the fourth-order during the tunneling process, resulting in almost complete lifting of the Coulomb blockade.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.109.077401